[gitg] Implemented amend

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 2e2f39ff52e6f00e582712f48b5cd1ba60183bac
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Sat Jul 6 13:33:53 2013 +0200

    Implemented amend

 libgitg/gitg-stage.vala |   37 ++++++++++++++++++++++++++++++++++---
 1 files changed, 34 insertions(+), 3 deletions(-)
---
diff --git a/libgitg/gitg-stage.vala b/libgitg/gitg-stage.vala
index cd6f08e..e836dbd 100644
--- a/libgitg/gitg-stage.vala
+++ b/libgitg/gitg-stage.vala
@@ -351,8 +351,39 @@ public class Stage : Object
                        // Note: get the symbolic ref here
                        var head = d_repository.lookup_reference("HEAD");
 
-                       // Resolve the ref and get the actual target id
-                       var headoid = head.resolve().get_target();
+                       Ggit.OId? headoid = null;
+
+                       try
+                       {
+                               // Resolve the ref and get the actual target id
+                               headoid = head.resolve().get_target();
+                       } catch {}
+
+                       Ggit.OId[] parents;
+
+                       if (headoid == null)
+                       {
+                               parents = new Ggit.OId[] {};
+                       }
+                       else
+                       {
+                               if ((options & StageCommitOptions.AMEND) != 0)
+                               {
+                                       var commit = d_repository.lookup<Ggit.Commit>(headoid);
+                                       var p = commit.get_parents();
+
+                                       parents = new Ggit.OId[p.size()];
+
+                                       for (int i = 0; i < p.size(); ++i)
+                                       {
+                                               parents[i] = p.get_id(i);
+                                       }
+                               }
+                               else
+                               {
+                                       parents = new Ggit.OId[] { headoid };
+                               }
+                       }
 
                        ret = d_repository.create_commit_from_oids("HEAD",
                                                                   author,
@@ -360,7 +391,7 @@ public class Stage : Object
                                                                   encoding,
                                                                   emsg,
                                                                   treeoid,
-                                                                  new Ggit.OId[] { headoid });
+                                                                  parents);
 
                        bool always_update = false;